![]() ![]() Your devices have different private (local) IP addresses, but the same public IP address. If you see the same IP address for both devices, you’re probably behind a NAT firewall. Now, on each of them, run a Google search for “what’s my IP?” Not sure if your wifi router has a NAT firewall enabled? Try connecting two devices to the same wifi network, such as a laptop and smartphone. ![]() If inbound internet traffic does not have a private IP address to forward to beyond the gateway, the NAT firewall knows the traffic is unsolicited and should be discarded.Ĭomputers and servers on the internet can only see the public IP address of the router and none of the private IP addresses of specific devices, like phones, laptops, smart TVs, internet-of-things devices, and game consoles. Any unsolicited requests or data packets are discarded, preventing communication with potentially dangerous devices on the internet. The server replies to the router with a copy of the website, which your router then forwards on to your device via the private IP address.Ī firewall is a layer of protection that prevents unwanted communications between devices on a network, such as the internet.Ī NAT firewall works by only allowing internet traffic to pass through the gateway if a device on the private network requested it. ![]() The router then translates the request and forwards it to the website’s server with its public-facing IP address, making a note of the originating private address. When you visit a website, your device sends a request to the router, identifying itself with its private IP address. JUMP STRAIGHT TO: The best VPNs with NAT Firewalls For example, all of the devices connected to a NAT-enabled wifi router have different private IP addresses, but share the router’s public IP address. These gateways are commonly found on wifi routers and some VPN services. In turn, all of those devices will have the same public IP address -that of the gateway-and unique private IP addresses. In simplest terms, NAT allows many devices on a private network to share a single gateway to the internet. In the field of computer networking, NAT stands for N etwork A ddress T ranslation. ![]()
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